parse a string in c to read integers and perform operation.  example:  input: 2+3 output: 5 OR input: 2*7 output: 14

Convert to C Language Program and add comments **GIVEN CODE** #include <iostream>#include <sstream>using namespace std; string encrypt(string s) {for (int i = 0; i < s.length(); i++) {switch(s[i]) {case 'a': s[i] = '*'; break;case 'e': s[i] = '$'; break;case 'i': s[i] = '/'; break;case 'o': s[i] = '+'; break;case 'u': s[i] = '-'; break;}}return s;} int main() { string sentence;cout << "Enter a string: ";getline(cin, sentence);cout << "Encrypted string is: " << encrypt(sentence) << endl; }

What is the difference between Strings and c-strings?

I need help with this problem on c language